* Test each drawbar on each manual. For B-3 or other console organs use the A# and B preset (reverse color) keys, and their corresponding sets of nine drawbars. The far left set is for the Upper Manual "A#" preset, the second set is for the Upper Manual "B" preset, the two drawbars in the middle are for the pedals, the third set is for the Lower Manual "A#" preset, and the fourth set is for the Lower Manual "B" preset. Hold a key down on the manual and try each drawbar to be sure they sound, making sure its corresponding preset is pressed.
;:Then, pick a preset and drawbar group and pull out the [first drawbar|1stDrawbar] from the left in that group (brown) and play from the first "C" note to the last "C", a total of 61 notes. It is normal for the first octave of tones to repeat on B-3 and similar organs due to the manual wiring. (This is not the case in some very early models) Then, push in the first brown drawbar and pull out the last white drawbar and starting from the second "C" (notice it's the same tone as key #61, last "C" was with the first brown drawbar out) on the same manual, play all remaining notes up to F# an octave from the end where the notes will again begin to repeat. This repeating is called [foldback|HarmonicFoldback] and is very important to the classic B-3 sound.
-* Repeat this procedure with all drawbar groups and both manuals. You can also try every note on every drawbar to be sure they all sound. If you have MissingTones, this may be simply a broken wire on the tonewheel generator, or in the harness between the manuals, or it may be a broken resistance wire within the manuals or other problem. Some are an easy fix, some are very difficult.
+* Repeat this procedure with all drawbar groups and both manuals. You can also try every note on every drawbar to be sure they all sound. If you have MissingTones, this may be simply a broken wire on the tonewheel generator, or in the harness between the manuals, or it may be a broken resistance wire within the manuals or other problem. Some are an easy fix, some are very difficult. You may also have some tonewheels that aren't spinning. They could just be bound up and in need of oiling
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* Check the [Percussion] on the B-3 and similarly equipped organs keeping in mind it only functions on the upper manual with the "B" preset. It does not work on the lower manual, or with any other preset down. Push all drawbars in, press the "B" preset for the upper manual, turn the percussion "ON" and play a note, listening for decay. Check the decay and "SECOND/THIRD" harmonic rocker switches. The "NORMAL/FAST DECAY" should function in this manner - the FAST decay should decay in about one second, the NORMAL decay should decay in about four seconds. There is an adjustment on the preamp for setting the decay. If you have no percussion, be sure you are checking it correctly. It may be simply a dead 12AU7 tube, or it may be a bad percussion transformer or other problem in the organ.
* Try the pedals. Pull out one of the pedal drawbars (two in the center of the organ between the sets of nine manual drawbars) and play each pedal. Then push the first in, pull out the other and repeat the test.
